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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 144 for “"Poly(methyl methacrylate)"”.
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Characterisation of Silsesquioxane-Poly(Methyl Methacrylate) blends
… have advantageous properties intermediate of polymers and ceramics, due to their inorganic-organic molecular structure. Current research has focused on the potential of this hybrid to enhance conventional materials. Through the incorporation of Silsesquioxanes in their various forms when used …
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Thermomechanical properties of polyhedral oligomeric silsequioxane- poly(methyl methacrylate) nanocomposites
Poly(methyl methacrylate)s (PMMA) containing polyhedral oligomeric silsesquioxane (POSS) nanoparticles (d [approx.] 1.5 nm) were subjected to heological, mechanical, and morphological tests to determine the effects that POSS has on the melt-state and solid-state properties of this commercially …
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Fracture-induced mechanophore activation and solvent healing in poly(methyl methacrylate)
… has been a dedicated drive towards the design of polymers and polymer matrix composites which possess these two qualities. Damage detection is a highly desirable functionality in engineering materials. The potential of using mechanophores, stress-sensitive molecules, as material stress sensors has …
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Highly Tough, Stiff, and Transparent Poly(Methyl Methacrylate) Composites Incorporating Thermoplastic Elastomer Nanofibrils
… in the other. For example, rigid, glassy polymers can be toughened by incorporating soft, rubbery materials, but the inclusion of rubbery materials significantly reduces their strength and stiffness. This dissertation aims to develop novel toughening agents that considerably enhance both …
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Preparation of CO2-Switchable Poly(Methyl Methacrylate) Latexes by Surfactant-Free Emulsion Polymerization
… focused on the preparation of CO2 switchable poly(methyl methacrylate) latexes by surfactant-free emulsion polymerization. N,N-Dimethylaminoethyl Methacrylate (DMAEMA) was chosen as the functional comonomer to act as an in-situ generated surface active agent as well as the CO2 responsive …
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Optical and mechanical properties of glass fiber and ribbon reinforced poly(methyl methacrylate) composites
… of the glass fiber reinforcement to that of the polymer matrix. Refractive index mismatch, resulting from temperature changes, leads to degradation of optical clarity in fiber composites due to light impinging upon the fiber/matrix interface at oblique angles of incidence. The plane parallel …
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Stereocomplex poly (methyl methacrylate) fibers and self-reinforced composites and structural color of butterflies and beetles - characterization, replication and mimicry
Stereocomplex poly(methyl methacrylate) (PMMA) fibers for the purpose of reinforcing PMMA materials were developed. These kinds of composites are known as "self-reinforced" composites. We were successful in producing stereocomplex PMMA fibers with three different methods - wet spinning, gel …
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A thermo-mechanical finite deformation theory of plasticity for amorphous polymers : application to micro-hot-embossing of poly(methyl methacrylate)
Amorphous thermoplastic polymers are important engineering materials; however, their nonlinear, strongly temperature- and rate-dependent elastic-visco-plastic behavior has, until now, not been very well understood. The behavior has previously been modeled with mixed success by existing constitutive …
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Kr-F laser surface treatment of poly(methyl methacrylate), glycol-modified poly(ethylene terephthalate), and polytetrafluoroethylene for enhanced adhesion of Escherichia Coli K-12
Environmental response as determined by the cell-polymer interaction stands as the greatest restriction to the implementation of new polymeric materials. Cell-polymer interactions are most influenced by substrate surface free energy, surface chemistry, topography, and rigidity[1]. Alteration of …
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Synthesis and Characterization of Multiphase Block Copolymers: Influence of Functional Groups on Macromolecular Architecture
Low molecular weight liquid polybutadienes (1000 – 2000 g/mol) consisting of 60 mol% 1,2-polybutadiene repeating units were synthesized via anionic telomerization and conventional anionic polymerization. Maintaining the initiation and reaction temperature less than 70 °C minimized chain transfer …
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Directed Phase Separation of Polymer Blends on Binary-Patterned Polymer Brushes
Self-assembly of well-defined polymer microstructures is of interest for applications such as polymer solar cells, light emitting diodes, microelectronics and biosensors. Chemically patterned substrates can direct the phase separation of thin films of polymer blends, producing controlled …
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Dynamic aspects of adsorbed polymer layers: Evidence of glass-like transitions
Measurements of the mass adsorbed of polymer layers adsorbed from dilute carbon tetrachloride solutions $(\approx$1.00 mg/mL) were made as a function of time using Fourier transform infrared spectroscopy in the mode of attenuated total reflection. The general experimental approach involved …
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Polymer dynamics in bulk, adsorbed and solution by NMR methods
… resonance (²H NMR) study of bulk and adsorbed polymers. Segmental dynamics of poly(methyl acrylate) is examined in bulk and when adsorbed to anopore, alumina and silica as a function of temperature. The second part investigates diffusion of small molecules in polymer solutions by pulsed …
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Design of a CMOS compatible, athermal, optical waveguide
… explored to serve as the low index material, poly(ether imide) (PI) and poly(methyl methacrylate) (PMMA). The slot waveguide with PI as the low index material had a simulated, device thermo-optic coefficient of -8.5 x 10-4K-1, and the slot waveguide with PMMA as the low index material had a …
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Presentation and accessibility of surface bound ligands on amphiphilic graft copolymer films
Amphiphilic comb-type graft copolymers comprising a poly(methyl methacrylate) (PMMA) backbone and short, polyethylene oxide (PEO) side chains, PMMA-g-PEO, are proposed to self-organize at the polymer/water interface, resulting in quasi-2D confinement of the backbone at the immediate surface. The …
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Synthesis and characterization of high Tg nanofoams based on pyromellitic dianhydride and 1,1-bis(4-aminophenyl)-1-phenyl-2,2,2-trifluoroethane polyimide block and graft copolymers
Thermally stable polyimide block and graft copolymers with labile con1ponents (especially polypropylene oxide), have been prepared and investigated as low dielectric materials that afford desirable thermal, mechanical and electrical properties. Polyimide nanofoams based upon the controlled …
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STUDYING THE INTERACTION OF NANO- & MICROPLASTICS WITH ENTEROVIRUS AND THEIR CYTOTOXICITY ON HUMAN LUNG CELL LINE
… the chronic effects of positively charged mixed polymer nanoplastic particles on a human lung cell line. Positively charged poly(methyl methacrylate) (PMMA) surfaces exhibited enhanced binding to EV-D68 compared with neutral and negatively charged surfaces, resulting in significant viral …
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Encapsulamento de nanopartículas magnéticas em polímeros acrílicos e avaliação de hipertermia para potencial tratamento de câncer
… iron oxide nanoparticles encapsulated in acrylic polymers. Magnetite (Fe3O4) was obtained through coprecipitation and encapsulated by inverse and direct miniemulsion polymerization, in poly(acrylic acid) and poly(methyl methacrylate), respectively. Besides, the folic acid bioconjugation with the …
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The study of ultrafast dynamics behind a solid-state shock front using optical nanogauges
Photothermal laser ablation is studied using poly-(methyl methacrylate) films doped with a dye, IR-165, which functions as a molecular heater and thermometer. Direct optical measurements of temperature are performed on samples heated by 100 ns near-IR pulses at 1.064 $\mu\rm m,$ at rates dT/dt …
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